From 67ce8a0672495d91ba8ba87aff107789d018f963 Mon Sep 17 00:00:00 2001 From: Bryan Brattlof Date: Wed, 9 Jul 2025 08:18:21 -0500 Subject: [PATCH 1/5] perf(linux): AM62AX: Update PREEMPT_RT perf numbers for 11.1 Update the real time Linux latency numbers for SDK 11.1 Signed-off-by: Bryan Brattlof --- .../linux/RT_Linux_Performance_Guide.rst | 14 +++++++++++--- .../rt-cpu-method-all-latency-histogram.png | Bin 6627 -> 6807 bytes 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/source/devices/AM62AX/linux/RT_Linux_Performance_Guide.rst b/source/devices/AM62AX/linux/RT_Linux_Performance_Guide.rst index 7c65ee6bf..020eaccfa 100644 --- a/source/devices/AM62AX/linux/RT_Linux_Performance_Guide.rst +++ b/source/devices/AM62AX/linux/RT_Linux_Performance_Guide.rst @@ -57,14 +57,22 @@ Test commands used for running stress-ng and cyclictest together stress-ng --cpu-method=all -c 4 & cyclictest -m -Sp80 -D6h -h400 -i200 -M -q -The latencies where observed with this SDK are summarized below: +The latencies observed with the default yocto SDK are summarized below: + +.. note:: + + A known issue in this SDK release is affecting this benchmark. + Applying `this patch`_ on Yocto's meta-ti layer will restore the + context switch latencies to the values you see below: .. csv-table:: :header: "Latencies","CPU 0","CPU 1","CPU 2","CPU 3" "Minimum (us)","5","5","5","5" - "Average (us)","5","6","6","5" - "Maximum (us)","68","31","34","28" + "Average (us)","6","6","6","6" + "Maximum (us)","31","29","30","30" .. image:: img/rt-cpu-method-all-latency-histogram.png + +.. _this patch: https://lists.yoctoproject.org/g/meta-ti/message/19089 diff --git a/source/devices/AM62AX/linux/img/rt-cpu-method-all-latency-histogram.png b/source/devices/AM62AX/linux/img/rt-cpu-method-all-latency-histogram.png index e2f0c31c0614005668602d16eb217bb0ca632369..57d67a85472cb6f5cd182c2e437a053d9d3235be 100644 GIT binary patch delta 6450 zcmZu#c_376)bEZNGxo_?$6zE&NV0{LvG1}LvhO8hkbSvhjY5`6mSimyvQ@H;rHB+F 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z`s0?nsxSAFO!j@V2l9S0LdEt^wk-dd4`@vDZ)XsgiI_6K;WSmnRc(CjhR0Y?ko~6a zjm$BBUjMMnX^AWRML9lW52u1x^%)Qf^S!gRvvK4hNzJrqc>hA@eb!MgoA5#q^Z6mEJ IqGQzm0E?Imz5oCK From 5e839204bf5949d143c4b4eecef5d18d410c8c6c Mon Sep 17 00:00:00 2001 From: Bryan Brattlof Date: Wed, 9 Jul 2025 08:20:39 -0500 Subject: [PATCH 2/5] perf(linux): AM62LX: Update PREEMPT_RT perf numbers for 11.1 Update the real-time Linux latency numbers for SDK 11.1 Signed-off-by: Bryan Brattlof --- .../linux/RT_Linux_Performance_Guide.rst | 14 +++++++++++--- .../rt-cpu-method-all-latency-histogram.png | Bin 6754 -> 6791 bytes 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst b/source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst index 9f47d9972..1dbe0921e 100644 --- a/source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst +++ b/source/devices/AM62LX/linux/RT_Linux_Performance_Guide.rst @@ -56,13 +56,21 @@ Test commands used for running stress-ng and cyclictest together stress-ng --cpu-method=all -c 4 & cyclictest -m -Sp80 -D6h -h400 -i200 -M -q -The latencies observed with this SDK are summarized below: +The latencies observed with the default yocto SDK are summarized below: + +.. note:: + + A known issue in this SDK release is affecting this benchmark. + Applying `this patch`_ on Yocto's meta-ti layer will restore the + context switch latencies to the values you see below: .. csv-table:: :header: "Latencies","CPU 0","CPU 1" "Minimum (us)","5","5" - "Average (us)","6","8" - "Maximum (us)","47","53" + "Average (us)","8","7" + "Maximum (us)","57","48" .. image:: img/rt-cpu-method-all-latency-histogram.png + +.. _this patch: https://lists.yoctoproject.org/g/meta-ti/message/19089 diff --git a/source/devices/AM62LX/linux/img/rt-cpu-method-all-latency-histogram.png b/source/devices/AM62LX/linux/img/rt-cpu-method-all-latency-histogram.png index f1e689e0a0ce9a472fb55d8ed31b65304387a180..942afe78d6a631e2f8dca25533a03ad56f26b034 100644 GIT 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zSbuicD2yN~jZIFpU$BCm7_7we?yzqX$BtIYUO))4chz2x+{hsDOV=NHj?<|Qt6v$qC}by7K%!WE1iIW+m+ zy2G~2@q?t6(ok1HAG>@H)u#9@GPz_#z09bxMSj}?%iF-brCHZ}+_);F5l%=wdSC5TdHs3q1Cw3_J_YX~hQ}<3c n8ER{io$3F|5IArE=eWnQ`QvHc6_$_yI=;{7ncxd`9Ekq|1~hbb From ce3c183a9ef13d02bcc0a171bede49443dc572e1 Mon Sep 17 00:00:00 2001 From: Bryan Brattlof Date: Wed, 9 Jul 2025 08:28:24 -0500 Subject: [PATCH 3/5] perf(linux): AM62PX: Update PREEMPT_RT perf numbers for 11.1 Update the real-time Linux latency numbers for SDK 11.1 Signed-off-by: Bryan Brattlof --- .../linux/RT_Linux_Performance_Guide.rst | 14 +++++++++++--- .../rt-cpu-method-all-latency-histogram.png | Bin 6580 -> 6925 bytes 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/source/devices/AM62PX/linux/RT_Linux_Performance_Guide.rst b/source/devices/AM62PX/linux/RT_Linux_Performance_Guide.rst index 780c34920..ce7e5b6ff 100644 --- a/source/devices/AM62PX/linux/RT_Linux_Performance_Guide.rst +++ b/source/devices/AM62PX/linux/RT_Linux_Performance_Guide.rst @@ -57,13 +57,21 @@ Test commands used for running stress-ng and cyclictest together stress-ng --cpu-method=all -c 4 & cyclictest -m -Sp80 -D6h -h400 -i200 -M -q -The latencies observed with this SDK are summarized below: +The latencies observed with the default yocto SDK are summarized below: + +.. note:: + + A known issue in this SDK rlease is affecting this benchmark. + Applying `this patch`_ on Yocto's meta-ti layer will restore the + context switch latencies to the values you see below. .. csv-table:: :header: "Latencies","CPU 0","CPU 1","CPU 2","CPU 3" "Minimum (usec)","5","5","5","5" - "Average (usec)","6","6","5","6" - "Maximum (usec)","30","33","31","35" + "Average (usec)","6","6","7","6" + "Maximum (usec)","36","34","37","34" .. image:: img/rt-cpu-method-all-latency-histogram.png + +.. _this patch: https://lists.yoctoproject.org/g/meta-ti/message/19089 diff --git 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YgJ&T)C90c8^$zEH+QwRyn#Az`1FZAzYXATM From 0229a79ef6a6d98e502c9b0ac34aab60f9c01b49 Mon Sep 17 00:00:00 2001 From: Bryan Brattlof Date: Wed, 9 Jul 2025 08:36:11 -0500 Subject: [PATCH 4/5] perf(linux): AM62X: Update PREEMPT_RT perf numbers for 11.1 Update the real-time Linux latency numbers for SDK 11.1 Signed-off-by: Bryan Brattlof --- .../linux/RT_Linux_Performance_Guide.rst | 17 +++++++++++++---- .../rt-cpu-method-all-latency-histogram.png | Bin 7115 -> 7060 bytes 2 files changed, 13 insertions(+), 4 deletions(-) diff --git a/source/devices/AM62X/linux/RT_Linux_Performance_Guide.rst b/source/devices/AM62X/linux/RT_Linux_Performance_Guide.rst index 35de6053f..ed8fafc48 100644 --- a/source/devices/AM62X/linux/RT_Linux_Performance_Guide.rst +++ b/source/devices/AM62X/linux/RT_Linux_Performance_Guide.rst @@ -61,13 +61,22 @@ Test commands used for running stress-ng and cyclictest together stress-ng --cpu-method=all -c 4 & cyclictest -m -Sp80 -D6h -h400 -i200 -M -q -The latencies observed with this SDK are summarized below: +The latencies observed with the default yocto SDK image on +https://www.ti.com/tool/SK-AM62B-P1 are summarized below: + +.. note:: + + A known issue in this SDK release is affecting this benchmark. + Applying `this patch`_ on Yocto's meta-ti layer will restore the + context switch latencies to the values you see below. .. csv-table:: :header: "Latencies","CPU 0","CPU 1","CPU 2","CPU 3" - "Minimum (usec)","5","5","4","4" - "Average (usec)","7","5","6","6" - "Maximum (usec)","66","41","73","70" + "Minimum (usec)","5","5","5","5" + "Average (usec)","6","6","6","6" + "Maximum (usec)","62","46","47","52" .. image:: img/rt-cpu-method-all-latency-histogram.png + +.. _this patch: https://lists.yoctoproject.org/g/meta-ti/message/19089 diff --git a/source/devices/AM62X/linux/img/rt-cpu-method-all-latency-histogram.png b/source/devices/AM62X/linux/img/rt-cpu-method-all-latency-histogram.png index 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Update PREEMPT_RT perf numbers for 11.1 Update the real-time Linux latency numbers for SDK 11.1 Signed-off-by: Bryan Brattlof --- .../linux/RT_Linux_Performance_Guide.rst | 16 ++++++++++++---- .../rt-cpu-method-all-latency-histogram.png | Bin 6578 -> 6933 bytes 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/source/devices/AM64X/linux/RT_Linux_Performance_Guide.rst b/source/devices/AM64X/linux/RT_Linux_Performance_Guide.rst index 1c0429250..6f5319f14 100644 --- a/source/devices/AM64X/linux/RT_Linux_Performance_Guide.rst +++ b/source/devices/AM64X/linux/RT_Linux_Performance_Guide.rst @@ -60,15 +60,23 @@ Test commands used for running stress-ng and cyclictest together The latencies observed with this DK are summarized below: +.. note:: + + A known issue in this SDK release is affecting this benchmark. + Applying `this patch`_ on Yocto's meta-ti layer will restore the + context switch latencies to the values you see below. + .. csv-table:: :header: "Latencies","CPU 0","CPU 1" "Minimum (usec)","6","6" - "Average (usec)","8","8" - "Maximum (usec)","77","105" + "Average (usec)","10","9" + "Maximum (usec)","77","52" .. image:: img/rt-cpu-method-all-latency-histogram.png +.. _this patch: https://lists.yoctoproject.org/g/meta-ti/message/19089 + | LMBench @@ -791,8 +799,8 @@ RP Message Inter-Processor Communication (IPC) Latency RP Message latency Performance ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -RP Message latency is the delay measured from sending a round trip echo message from -a Linux application to a remote processor and back. The following measurements use +RP Message latency is the delay measured from sending a round trip echo message from +a Linux application to a remote processor and back. The following measurements use a RP message length of 1 byte and 490 bytes for comparison. The Linux user space application `rpmsg_char_benchmark `__ captures these latency values. diff --git a/source/devices/AM64X/linux/img/rt-cpu-method-all-latency-histogram.png b/source/devices/AM64X/linux/img/rt-cpu-method-all-latency-histogram.png index 54a41d8d5ba7567a5c358d08d29e40d334c81c3a..eff07aff2ba3bf0e9de6c18c1ff447e757a13b81 100644 GIT binary patch delta 6615 zcmZ{IXIN8Puy%F|34{_M(xfDa6s3uXQCjG|SOBR83nI-(Z<0+%5ClX~1O+P!A|eO~ zNCKiLMG&M5;m|d7X-c^}9?$cA_s7kjWX+y6Gi&xc@61Z+fg9>2p#V)J-qb+%L`cp| zF80lXXZ&$mqZDl|UePM8ZQ>w|E73zPbKY?~*y=R5-nr^GA(*aG*#GfaPP_WDUmbK! zbFSr@3ryEz4KFIDrILf5T@j2DN-OI_!Y7KIhQuC93ZyLjJ!=t<+Vu~6=G4p zE0DLFEe}|wI8I&T283FF4F+xE+l)+wwR%Svr)QwZ?ej7m<9{@J(@@I6x-PtbX| zn7T3M2!6lU{RZ6IRD0!JK!Y{yvf7iCz5a8$u@d#Ga`mLNnCqOVDO%NqJwsnj@J#vI zS|t;fw#3_ctvu4Y@%+B4R@%W065d0gIKM%Be#&R&uXA48;ZJVr+yBZO6026vu6nn< z2)h=k{kQ^N1|=-=SEKc8KbXhsOfsPG?#hI7~JA3!L*q>(2a~yd%cXZIl05_^qEA^{;Se?}BNY!+NXCtob{<^S`tfuRds}UZOKk--JbaR7v((hfoMb*du>HO)m 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